Dmx storage refactor

- changed design of dmx_universes
- made dmx_universes static
- added "enum dmx_universe_state" for easy on/off switching

ECMD:
- added "dmx set {universe} {on,off}"
- added universe state to "dmx universe"

Webinterface:
![LIVE](http://i.imgur.com/IeeGBBA.png)
![BLACKOUT](http://i.imgur.com/MsXdqUG.png)

*Warning*: This breaks custom modules that use dmx-storage!

Please pull